
When you ask "What number is halfway between 5 and 305?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=5 and Y=305.

To find the number halfway between 5 and 305, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 305 into our formula, we get:
(5 + 305)/2 = 155
Thus, the number halfway between 5 and 305 is 155.
To check that our answer is correct, we subtract 5 from 155 and subtract 155 from 305 and compare the two numbers:
155 - 5 = 150
305 - 155 = 150
As you can see, the halfway number is 150 higher than 5 and 150 lower than 305. Therefore, our halfway between answer of 155 above is correct.
Halfway Between
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Halfway Between 5 and 306
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